Atsina

At·si·na (ăt-sēʹnə) n. pl. Atsina or At·si·nas In both senses also called Gros Ventre.

1.

a. A Native American people formerly inhabiting the plains of northern Montana and southern Saskatchewan, with a present-day population in north central Montana.

b. A member of this people.

2. The Algonquian language of the Atsina, dialectally related to Arapaho.

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▪ people

also called  Gros Ventres of the Prairie 

      North American Indian tribe related to the Algonquian-speaking Arapaho, from which they may have separated as early as 1700. The Atsina were living in what is now northern Montana and adjacent regions of Canada in late-prehistoric times and were culturally similar to other Plains tribes. Atsina descendants numbered more than 6,000 in the early 21st century. See also Arapaho.

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